I have this idea about making this paladin 25 Harper scout 5 / wizard 10 with dev crit on this PW i play on, but have no clue how to allocate the stats, nor the feats for maximum AB and AC, could some of you epicly experienced builders give me some pointers, so i wont fumble too much? Maybe it's just me, but I don't quite get this build. Why do a Paladin/Wizard? If you did a Paladin/Sorc you would get a double benefit from raising Charisma; you would get better saves, and your spells would be more effective (also more spells per day).

I suppose the Harper Scout could be useful because of the fact that their buffs stack, but other than that they seem kind of worthless. They require 2 feats that I wouldn't otherwise take (Alertness and Iron Will), and it takes 5 levels away from another class that could potentially give you more useful abilities. Just checked the index of builds, and I must say there aren't very many Harper builds, so there must be a reason.

If you want a stronger build I would probably recommend something like Paladin/Sorc/RDD, Paladin/Fighter/Sorc, or even Rogue/Paladin/Sorc or Cleric/Paladin/Sorc.

Still, if you insist on doing a Paladin/Wizard/Harper I shall attempt to oblige:

Paladin 23/Wizard 12/Harper Scout 5
(Pre-epic Paladin 20)

Race: Human

Stats

Starting

Str 14
Dex 8
Con 14
Int 14
Wis 14
Cha 14

Ending

Str 26
Dex 8
Con 14
Int 16
Wis 14
Cha 14

2 points into Int, 8 points into Str

Feats

1 Power Attack, Cleave
3 Toughness
6 Weapon Focus
9 Alertness (Harper pre-req)
12 Iron Will (Harper pre-req)
15 Improved Critical
18 Great Cleave
21 Epic Weapon Focus, Harper Knowledge, Favored Enemy
24 Great Str I
25 Wizard: Still Spell
27 Great Str II
30 Great Str III
31 Wizard: Craft Wand
33 Great Str IV, Harper: Deneir’s Eye
36 Overwhelming Critical, Paladin: Devastating Critical
38 Harper: Tymora’s Smile
39 Armor Skin, Harper: Favored Enemy, Harper: Lliira’s Heart
40 Craft Harper Item

Level Progression:

1-20 Paladin
21 Harper
22-32 Wizard
33 Harper
34-36 Paladin
37 Wizard
38-40 Harper

Anyway, that's about what your build would look like. You can feel free to change the leveling progression if you want to, but be aware that if you add levels of Wizard or Harper pre-epic (before level 21) it will water down your AB. Check the AB table at the back of the manual if you want more info on how this works.

Also note that you will want to make sure to take a level of Wizard and Harper late in the build (lvl 37 or later) in order to max out your bonuses from Spellcraft and Tumble, respectively. The reason of taking harper is that, when you take him on epic levels, at levels 1 and 5 you can take Great Dexterity or Great Charisma instead of their usual favored enemy. That makes them pretty powerful.